Help on garage project... - Router Forums
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post #1 of 38 (permalink) Old 01-06-2017, 10:44 AM Thread Starter
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Default Help on garage project...

Getting ready to install insulated ceiling in my garage. The firewall between house and garage goes floor to ceiling with no exposed 2x4 on which to attach the insulation, or drywall. So I have to put up a 2x4 up and attach it.
Question is, can I mount it (with long screws) on top of the existing drywall, or should I cut the drywall out and mount the 2x4 directly to the underlying wood?

I know the drywall is extra thick and fire retardant. (a 2 hour wall as I understand it), so I don't know if I can legally break through the drywall, or if there is some appropriate way to handle this?

The more I do, the less I accomplish.
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post #2 of 38 (permalink) Old 01-06-2017, 11:17 AM
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Have you considered removing the existing drywall and insulating, then putting new drywall in? Usually, 2 hour firewalls are 5/8" drywall on both sides of the wall, but sometimes contractors will use two layers of 1/2" on the garage side to gain the necessary thickness. I would think that it would be much easier to install insulation in the existing stud cavity instead of tacking on an additional 2x4 frame to hold the insulation/drywall...

If you do make cuts into the existing drywall, the holes need to be well sealed with mud to prevent hot gasses from entering the attic space. Those holes can cause a small fire in the garage to move into the attic and burn off the roof. I saw that more than a few times over the years...
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post #3 of 38 (permalink) Old 01-06-2017, 01:34 PM
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Do NOT cut into the drywall, Tom!!! I mentioned a couple of years back, about an arsonist in my neighbourhood, back then,.
He'd started a fire in the rear of a four-plex and the fire was so hot that it consumed everything in it's path...but it was stopped dead in its tracks by the 5/8" 'Fireguard' drywall. Man, was I impressed!
Dan (above) is absolutely correct, but getting rid of old drywall has become a bit of a p.i.t.a., and if you can live with losing 4" of floor space go with the new framed wall...just my personal choice.
Not necessary to anchor it to the existing wall. Nail it through to the ceiling framing and the floor, same as you would with any other partition wall. Run your wiring then insulate and board. If you can get some help, use 12' sheets or whatever works for your wall length, horizontally! I know stick thinks vertical is the way to go, but taping and filling a 4' high seam at waist height and maybe one or two vertical joints beats a bunch of 8' high joints all to Hell!
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post #4 of 38 (permalink) Old 01-06-2017, 01:45 PM
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Glue foam insulation sheets to the wall?

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post #5 of 38 (permalink) Old 01-06-2017, 01:52 PM
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We maintain firewalls in construction. Maintain existing You can screw 2's to the corresponding studs if you want 1 1/2" cavity. Why insulate an interior wall? soundproofing?
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post #6 of 38 (permalink) Old 01-06-2017, 02:51 PM
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Quote:
Originally Posted by paduke View Post
We maintain firewalls in construction. Maintain existing You can screw 2's to the corresponding studs if you want 1 1/2" cavity. Why insulate an interior wall? soundproofing?
I agree, why are you insulating the wall, Tom?
I like the suggestion of 1 1/2" furring and foam bat insulation from Lowes, if it is necessary to insulate.
Are you talking about the wall separation in the attic?
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post #7 of 38 (permalink) Old 01-06-2017, 03:43 PM
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Wish I had insulation
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I donít always insulate , but when I do .
Ok ,I never insulate
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post #8 of 38 (permalink) Old 01-06-2017, 03:46 PM
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Hold on? if it's a firewall between the house and the garage the walls already insulated

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post #9 of 38 (permalink) Old 01-06-2017, 03:57 PM
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Hold on? if it's a firewall between the house and the garage the walls already insulated
Exactly.
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post #10 of 38 (permalink) Old 01-06-2017, 04:33 PM
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"Hold on? if it's a firewall between the house and the garage the walls already insulated"

...you can never have too much insulation, right, Rick?
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